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WO2006118841A1 - Systeme hydraulique ayant un compensateur de pression - Google Patents

Systeme hydraulique ayant un compensateur de pression Download PDF

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Publication number
WO2006118841A1
WO2006118841A1 PCT/US2006/015360 US2006015360W WO2006118841A1 WO 2006118841 A1 WO2006118841 A1 WO 2006118841A1 US 2006015360 W US2006015360 W US 2006015360W WO 2006118841 A1 WO2006118841 A1 WO 2006118841A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
fluid
passageway
valves
pressure
Prior art date
Application number
PCT/US2006/015360
Other languages
English (en)
Inventor
Pengfei Ma
Gene R. St. Germain
Jiao Zhang
Aleksandar M. Egelja
Robert S. Lehmann
Michael A. Sorokine
Original Assignee
Caterpillar Inc.
Shin Caterpillar Mitsubishi Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Inc., Shin Caterpillar Mitsubishi Ltd. filed Critical Caterpillar Inc.
Priority to JP2008508974A priority Critical patent/JP5297187B2/ja
Priority to CN2006800146149A priority patent/CN101166904B/zh
Priority to DE112006001100.6T priority patent/DE112006001100B4/de
Publication of WO2006118841A1 publication Critical patent/WO2006118841A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3052—Shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50572—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using a pressure compensating valve for controlling the pressure difference across a flow control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves
    • F15B2211/5059—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves using double counterbalance valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/51—Pressure control characterised by the positions of the valve element
    • F15B2211/513—Pressure control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations

Definitions

  • the present disclosure relates generally to a hydraulic system, and more particularly, to a hydraulic system having a pressure compensator.
  • actuators are fluidly connected to a pump on the work machine that provides pressurized fluid to chambers within the actuators.
  • An electro-hydraulic valve arrangement is typically fluidly connected between the pump and the actuators to control a flow rate and direction of pressurized fluid to and from the chambers of the actuators.
  • the '647 patent describes a hydraulic circuit having two pairs of solenoid valves, a variable displacement pump, a reservoir tank, and a hydraulic actuator.
  • One pair of the solenoid valves includes a head-end supply valve and a head-end return valve that connects a head end of the hydraulic actuator to either the variable displacement pump or the reservoir tank.
  • the other pair of solenoid valves includes a rod-end supply valve and a rod-end return valve that connects a rod end of the hydraulic actuator to either the variable displacement pump or the reservoir tank.
  • Each of these four solenoid valves is associated with a different pressure compensating check valve.
  • Each pressure compensating check valve is connected between the associated solenoid valve and the actuator to control a pressure of the fluid between the associated valve and the actuator.
  • the multiple pressure compensating valves of the hydraulic circuit described in the '647 patent may reduce pressure fluctuations within the hydraulic circuit, they may increase the cost and complexity of the hydraulic circuit.
  • the pressure compensating valves of the '647 patent may not control the pressures within the hydraulic circuit precise enough for optimal performance of the associated actuator.
  • the disclosed hydraulic cylinder is directed to overcoming one or more of the problems set forth above.
  • the present disclosure is directed to a hydraulic system.
  • the hydraulic system includes a source of pressurized fluid and a fluid actuator with a first chamber and a second chamber.
  • the hydraulic system also includes a first valve configured to selectively fluidly communicate the source with the first chamber, and a second valve configured to selectively fluidly communicate the source with the second chamber.
  • the hydraulic system also includes a supply passageway configured to direct pressurized fluid from the source to the first and second valves in parallel.
  • the hydraulic system also includes a signal passageway disposed between the first and second valves, the first and second valves being connected in parallel with the signal passageway.
  • the hydraulic system also includes a proportional pressure compensating valve configured to control a pressure of a fluid directed between the source and the first and second valves.
  • the hydraulic system further includes at least one fluid passageway disposed between the supply and signal passageways to fluidly communicate the supply and signal passageways.
  • the present disclosure is directed to a hydraulic valve unit that includes a valve body.
  • the valve body includes a first valve configured to selectively fluidly communicate a source of pressurized fluid with a first chamber of a fluid actuator and a second valve configured to selectively fluidly communicate the source with a second chamber of the fluid actuator.
  • the valve body also includes a supply passageway disposed between the first and second valves in parallel.
  • the valve body further includes a proportional pressure compensating valve disposed within the supply passageway between the source and the first and second valves. The proportional pressure control valve is configured to control a pressure of fluid directed between the first and second valves.
  • the present disclosure is directed to a method of operating a hydraulic system.
  • the method includes pressurizing a fluid, directing the pressurized fluid via a supply passageway to a first valve in communication with a first chamber of a fluid actuator, and directing the pressurized fluid to a second valve via the supply passageway in communication with a second chamber of the fluid actuator.
  • the method also includes selectively operating at least one of the first and second valves to move the fluid actuator.
  • the method also includes directing pressurized fluid from a signal passageway disposed downstream of the first and second valves to a pressure compensating valve element and directing pressurized fluid from the supply passageway to the signal passageway via at least one fluid passageway.
  • the method further includes moving a proportional pressure compensating valve element in response to pressures at an inlet and an outlet of one of the first and second valves to maintain a pressure differential across the one of the first and second valves within a predetermined range of a desired pressure differential.
  • Fig. 1 is a side-view diagrammatic illustration of a work machine according to an exemplary disclosed embodiment
  • Fig. 2 is a schematic illustration of an exemplary disclosed hydraulic circuit
  • Fig. 3 is a schematic illustration of another exemplary disclosed hydraulic circuit.
  • Fig. 1 illustrates an exemplary work machine 10.
  • Work machine 10 may be a fixed or mobile machine that performs some type of operation associated with an industry such as mining, construction, farming, or any other industry known in the art.
  • work machine 10 may be an earth moving machine such as a dozer, a loader, a backhoe, an excavator, a motor grader, a dump truck, or any other earth moving machine.
  • Work machine 10 may also include a generator set, a pump, a marine vessel, or any other suitable operation-performing work machine.
  • Work machine 10 may include a frame 12, at least one work implement 14, and at least one hydraulic cylinder 16 connecting work implement 14 to frame 12.
  • Frame 12 may include any structural unit that supports movement of work machine 10.
  • Frame 12 may be, for example, a stationary base frame connecting a power source (not shown) to a traction device 18, a movable frame member of a linkage system, or any other type of frame known in the art.
  • Work implement 14 may include any device used in the performance of a task.
  • work implement 14 may include a blade, a bucket, a shovel, a ripper, a dump bed, a propelling device, or any other task- performing device known in the art.
  • Work implement 14 may be connected to frame 12 via a direct pivot 20, via a linkage system with hydraulic cylinder 16 forming one member in the linkage system, or in any other appropriate manner. Work implement 14 may be configured to pivot, rotate, slide, swing, or move relative to frame 12 in any other manner known in the art.
  • hydraulic cylinder 16 may be one of various components within a hydraulic system 22 that cooperate to move work implement 14.
  • Hydraulic system 22 may include a source 24 of pressurized fluid, a tank 34, and a valve body 90. It is contemplated that hydraulic system 22 may include additional and/or different components such as, for example, a pressure sensor, a temperature sensor, a position sensor, a controller, an accumulator, and other components known in the art.
  • Hydraulic cylinder 16 may include a tube 46 and a piston assembly
  • Hydraulic cylinder 16 may include a first chamber 50 and a second chamber 52 separated by piston assembly 48.
  • the first and second chambers 50, 52 may be selectively supplied with a fluid pressurized by source 24 and fluidly connected with tank 34 to cause piston assembly 48 to displace within tube 46, thereby changing the effective length of hydraulic cylinder 16.
  • the expansion and retraction of hydraulic cylinder 16 may function to assist in moving work implement 14.
  • Piston assembly 48 may include a piston 54 axially aligned with and disposed within tube 46, and a piston rod 56 connectable to one of frame 12 and work implement 14 (referring to Fig. 1).
  • Piston 54 may include a first hydraulic surface 58 and a second hydraulic surface 59 opposite first hydraulic surface 58.
  • An imbalance of force caused by fluid pressure on first and second hydraulic surfaces 58, 59 may result in movement of piston assembly 48 within tube 46. For example, a force on first hydraulic surface 58 being greater than a force on second hydraulic surface 59 may cause piston assembly 48 to displace to increase the effective length of hydraulic cylinder 16.
  • a sealing member (not shown), such as an o-ring, may be connected to piston 54 to restrict a flow of fluid between an internal wall of tube 46 and an outer cylindrical surface of piston 54.
  • Source 24 may be configured to produce a flow of pressurized fluid and may include a pump such as, for example, a variable displacement pump, a fixed displacement pump, or any other source of pressurized fluid known in the art.
  • Source 24 may be drivably connected to a power source (not shown) of work machine 10 by, for example, a countershaft (not shown), a belt (not shown), an electrical circuit (not shown), or in any other suitable manner.
  • Source 24 may be disposed between tank 34 and valve body 90, Source 24 may be dedicated to supplying pressurized fluid only to hydraulic system 22, or alternately may supply pressurized fluid to additional hydraulic systems 55 within work machine 10.
  • Tank 34 may constitute a reservoir configured to hold a supply of fluid.
  • the fluid may include, for example, a dedicated hydraulic oil, an engine . lubrication oil, a transmission lubrication oil, or any other fluid known in the art.
  • One or more hydraulic systems within work machine 10 may draw fluid from and return fluid to tank 34. It is also contemplated that hydraulic system 22 may be connected to multiple separate fluid tanks.
  • Valve body 90 may include multiple bores and conduits therein.
  • valve body 90 may constitute a housing configured to contain, support, and/or constitute various components of hydraulic system 22.
  • Valve body 90 may be in fluid communication with first chamber 50 via a port 92, with second chamber 52 via a port 94, with source 24 via a port 102, and with tank 34 via ports 96, 98, 100.
  • ports 92, 94, 96, 98, 100, 102 may be formed at boundaries of valve body 90 and may be configured to permit connection between valve body 90 and source 24, fluid actuator 16, and tank 34. It is contemplated that ports 96, 98, 100, may be formed as a single port or any desirable number of ports to permit connection between valve body 90 and tank 34.
  • Valve body 90 may include a head-end supply valve 26, a head-end drain valve 28, a rod-end supply valve 30, a rod-end drain valve 32, and a proportional pressure compensating valve 36. Valve body 90 may also include a head-end pressure relief valve 38, a headend makeup valve 40, a rod-end pressure relief valve 42, and a rod-end makeup valve 44. Valve body 90 may also include fluid passageways 60, 62, 64, 66, 68, 78, 82, a shuttle valve 74, a check valve 76, and restrictive orifices 70, 72, 80, 84. It is contemplated that valve body 90 may be an integral housing and may be connected to or mounted on frame 12 in any suitable manner known in the art.
  • Head-end supply valve 26 may be disposed within valve body 90 in fluid communication with source 24 and first chamber 50 via ports 102 and 92, respectively, and configured to regulate a flow of pressurized fluid to first chamber 50.
  • head-end supply valve 26 may include a two-position spring biased valve element 200 supported within a bore 202 formed in valve body 90.
  • Valve element 200 may be solenoid actuated and configured to move between a first position at which fluid is allowed to flow to first chamber 50 and a second position at which fluid flow is blocked from flowing to first chamber 50. It is contemplated that head-end supply valve 26 may include additional or different mechanisms such as, for example, a proportional valve element or any other valve mechanisms known in the art.
  • head-end supply valve 26 may alternately be hydraulically actuated, mechanically actuated, pneumatically actuated, or actuated in any other suitable manner. It is further contemplated that head-end supply valve 26 may be configured to allow fluid from first chamber 50 to flow through head-end supply valve 26 via port 92 during a regeneration event when a pressure within first chamber 50 exceeds a pressure directed to head-end supply valve 26 from source 24.
  • Head-end drain valve 28 may be disposed within valve body 90 in fluid communication with first chamber 50 and tank 34 via ports 92 and 100, respectively, and configured to regulate a flow of pressurized fluid from first chamber 50 to tank 34.
  • head-end drain valve 28 may include a two- position spring biased valve element 204 supported within a bore 206 formed in valve body 90.
  • Valve element 204 may be solenoid actuated and configured to move between a first position at which fluid is allowed to flow from first chamber 50 and a second position at which fluid is blocked from flowing from first chamber 50.
  • head-end drain valve 28 may include additional or different valve mechanisms such as, for example, a proportional valve element or any other valve mechanism known in the art.
  • head-end drain valve 28 may alternately be hydraulically actuated, mechanically actuated, pneumatically actuated, or actuated in any other suitable manner.
  • Rod-end supply valve 30 may be disposed within valve body 90 in fluid communication with source 24 and second chamber 52 via ports 102 and 94, respectively, and configured to regulate a flow of pressurized fluid to second chamber 52.
  • rod-end supply valve 30 may include a two-position spring biased valve element 208 supported within a bore 210 formed in valve body 90.
  • Valve element 208 may be solenoid actuated and configured to move between a first position at which fluid is allowed to flow to second chamber 52 and a second position at which fluid is blocked from flowing to second chamber 52. It is contemplated that rod-end supply valve 30 may include additional or different valve mechanisms such as, for example, a proportional valve element or any other valve mechanism known in the art.
  • rod-end supply valve 30 may alternately be hydraulically actuated, mechanically actuated, pneumatically actuated, or actuated in any other suitable manner. It is further contemplated that rod-end supply valve 30 may be configured to allow fluid from second chamber 52 to flow through rod-end supply valve 30 via port 94 during a regeneration event when a pressure within second chamber 52 exceeds a pressure directed to rod-end supply valve 30 from source 24.
  • Rod-end drain valve 32 may be disposed within valve body 90 in fluid communication with second chamber 52 and tank 34 via ports 94 and 100, respectively, and configured to regulate a flow of pressurized fluid from second chamber 52 to tank 34.
  • rod-end drain valve 32 may include a two- position spring biased valve element 212 supported within a bore 214 formed in valve body 90.
  • Valve element 212 may be solenoid actuated and configured to move between a first position at which fluid is allowed to flow from second chamber 52 and a second position at which fluid is blocked from flowing from second chamber 52. It is contemplated that rod-end drain valve 32 may include additional or different valve mechanisms such as, for example, a proportional valve element or any other valve mechanism known in the art.
  • rod-end drain valve 32 may alternately be hydraulically actuated, mechanically actuated, pneumatically actuated, or actuated in any other suitable manner.
  • Head-end and rod-end supply and drain valves 26, 28, 30, 32 may be fluidly interconnected.
  • head-end and rod-end supply valves 26, 30 may be connected in parallel to an upstream common supply fluid passageway 60 and connected to a downstream common signal fluid passageway 62.
  • Upstream common supply fluid passageway 60 and downstream common signal fluid passageway 62 may each be a separate conduit formed in valve body 90 and may connect head-end and rod-end supply valve bores 202, 210.
  • Head-end and rod-end drain valves 28, 32 may be connected in parallel to a downstream common drain passageway 64.
  • Common drain passageway 64 may be a conduit formed in valve body 90 and may connect head-end and rod-end drain valve bores 206, 214 and terminate at port 100 to permit fluid flow to tank 34.
  • Head-end supply and drain valves 26, 28 may be connected in parallel to a first chamber fluid passageway 61.
  • First chamber fluid passageway 61 may be a conduit formed in valve body 90 that connects head-end supply and drain valve bores 202, 206.
  • the first chamber fluid conduit of passageway 61 may terminate at fluid port 92 formed at a boundary of valve body 90 to permit fluid flow to first chamber 50.
  • Rod-end supply and return valves 30, 32 may be connected in parallel to a second chamber fluid passageway 63.
  • Second chamber fluid passageway 63 may be a conduit formed in valve body 90 and may connect rod-end supply and drain valve bores 210, 212 and may terminate at fluid port 94 to permit fluid flow to second chamber 52.
  • Head-end pressure relief valve 38 may be fluidly connected to first chamber fluid passageway 61 between first chamber 50 and head-end supply and drain valves 26, 28.
  • Head-end pressure relief valve 38 may have a spring biased valve element (not referenced) supported within a bore (not referenced) formed in valve body 90.
  • the first chamber fluid conduit of passageway 61 may connect the head-end pressure relief valve bore and may terminate at port 96 to permit fluid flow through head-end pressure relief valve 38 to tank 34.
  • the valve element may be spring biased toward a valve closing position and movable to a valve opening position in response to a pressure within first chamber fluid passageway 61 being above a predetermined pressure. In this manner, head-end pressure relief valve 38 may be configured to reduce a pressure spike within hydraulic system 22 caused by external forces acting on work implement 14 and piston 54 by allowing fluid from first chamber 50 to drain to tank 34.
  • Head-end makeup valve 40 may be fluidly connected to first chamber fluid passageway 61 between first chamber 50 and head-end supply and drain valves 26, 28.
  • Head-end makeup valve 40 may have a valve element (not referenced) supported within a bore (not referenced) formed in valve body 90 and configured to allow fluid from tank 34 into first chamber fluid passageway 61 in response to a fluid pressure within first chamber fluid passageway 61 being below a pressure of the fluid within tank 34.
  • the head-end makeup valve bore may be connected to the first chamber fluid conduit of passageway 61 to permit fluid flow from port 96 through head-end makeup valve 40 to first chamber 50.
  • head-end makeup valve 40 may be configured to reduce a drop in pressure within hydraulic system 22 caused by external forces acting on work implement 14 and piston 54 by allowing fluid from tank 34 to fill first chamber 50.
  • Rod-end pressure relief valve 42 may be fluidly connected to second chamber fluid passageway 63 between second chamber 52 and rod-end supply and drain valves 30, 32.
  • Rod-end pressure relief valve 42 may have a spring biased valve element (not referenced) supported within a bore (not referenced) formed in valve body 90.
  • the second chamber conduit of passageway 63 may connect the head-end pressure relief valve bore and may terminate at port 98 to permit fluid flow through head-end pressure relief valve 42 to tank 34.
  • the valve element may be spring biased toward a valve closing position and movable to a valve opening position in response to a pressure within first chamber fluid passageway 63 being above a predetermined pressure.
  • rod-end pressure relief valve 42 may be configured to reduce a pressure spike within hydraulic system 22 caused by external forces acting on work implement 14 and piston 54 by allowing fluid from second chamber 52 to drain to tank 34.
  • Rod-end makeup valve 44 may be fluidly connected to second chamber fluid passageway 63 between second chamber 52 and rod-end supply and drain valves 30, 32.
  • Rod-end makeup valve 44 may have a valve element (not referenced) supported within a bore (not referenced) formed in valve body 90 and configured to allow fluid from tank 34 into second chamber fluid passageway 63 in response to a fluid pressure within second chamber fluid passageway 63 being below a pressure of the fluid within tank 34.
  • the head-end makeup valve bore may be connected to the second chamber fluid conduit of passageway 63 to permit fluid flow from port 98 through head-end makeup valve 44 to second chamber 52.
  • rod-end makeup valve 44 may be configured to reduce a drop in pressure within hydraulic system 22 caused by external forces acting on work implement 14 and piston 54 by allowing fluid from tank 34 to fill second chamber 52.
  • Valve body 90 may include additional components to control fluid pressures and/or flows within hydraulic system 22.
  • valve body 90 may include shuttle valve 74 disposed within downstream common signal fluid passageway 62.
  • Shuttle valve 74 may include a shuttle valve element (not referenced) supported within a bore (not referenced) formed in valve body 90.
  • the shuttle valve bore may be connected to the downstream common signal fluid conduit of passageway 62.
  • Shuttle valve 74 may be configured to fluidly connect the one of head-end and rod-end supply valves 26, 30 having a lower fluid pressure to proportional pressure compensating valve 36 in response to a higher fluid pressure from either head-end or rod-end supply valves 26, 30.
  • valve body 90 may also include pressure balancing passageways 66, 68 to control fluid pressures and/or flows within hydraulic system 22. Fluid passageways 66, 68 may each be configured as a separate conduit formed in valve body 90 to fluidly connect upstream common supply fluid passageway 60 and downstream common signal fluid passageway 62.
  • Fluid passageways 66, 68 may include restrictive orifices 70, 72, respectively, formed within valve body 90 to minimize pressure and/or flow oscillations within fluid passageways 66, 68. It is contemplated that fluid passageways 66, 68 may alternately be formed as conduits in rod-end and head-end supply valve elements 202, 210, respectively (not shown), and restrictive orifices 70, 72 may be formed within rod-end and head-end valve elements 202, 210 to minimize pressure and/or flow oscillations within fluid passageways 66, 68.
  • Valve body 90 may also include a check valve 76 disposed between proportional pressure compensating valve 36 and upstream fluid passageway 60.
  • Check valve 76 may include a check valve element (not referenced) supported within valve body 90. It is contemplated that hydraulic system 22 and/or valve body 90 may include additional and/or different components to control fluid pressures and/or flows within hydraulic system 22.
  • Proportional pressure compensating valve 36 may be a hydro- mechanically actuated proportional control valve disposed between upstream common supply fluid passageway 60 and source 24, and may be configured to control a pressure of the fluid supplied to upstream common supply fluid passageway 60.
  • proportional pressure compensating valve 36 may include a pressure compensating valve element 216 supported within a pressure compensating bore 218 formed in valve body 90.
  • the proportional pressure compensating valve element may be connected to the upstream common supply conduit of passageway 60 and may be further connected to port 102, either directly or via an inlet fluid conduit (not referenced) formed in valve body 90.
  • Valve element 216 may be spring and hydraulically biased toward a flow passing position and movable by hydraulic pressure toward a flow blocking position.
  • Proportional pressure compensating valve 36 may be movable toward the flow blocking position by a fluid directed via a fluid passageway 78 from a point between proportional pressure compensating valve 36 and check valve 76.
  • Fluid passageway 78 may be a conduit formed within valve body 90 and may connect pressure compensating bore 218 and the upstream common supply conduit of passageway 60.
  • Fluid passageway 78 may include a restrictive orifice 80 formed in valve body 90 to minimize pressure and/or flow oscillations within fluid passageway 78.
  • Proportional pressure compensating valve 36 may be movable toward the flow passing position by a fluid directed via a fluid passageway 82 from shuttle valve 74.
  • Fluid passageway 82 may be a conduit formed within valve body 90 and may connect the bore of shuttle valve 74 and pressure compensating bore 218.
  • Fluid passageway 82 may include a restrictive orifice 84 formed within valve body 90 to minimize pressure and/or flow oscillations within fluid passageway 82. It is contemplated that pressure compensating valve element 216 may alternately be spring biased toward a flow blocking position, that the fluid from passageway 82 may alternately bias the valve element of proportional pressure compensating valve 36 toward the flow passing position, and/or that the fluid from passageway 78 may alternately move the valve element of proportional pressure compensating valve 36 toward the flow blocking position. It is also contemplated that proportional pressure compensating valve 36 may alternately be located downstream of head-end and rod-end supply valves 26, 30 or in any other suitable location. It is also contemplated that restrictive orifices 80 and 84 may be omitted, if desired.
  • Head-end and rod-end supply valves 26, 30 may be configured to selectively control the fluid flow in pressure balancing passageways 66, 68.
  • Headend supply valve 26 may include a two-position spring biased valve element 200' supported within bore 202 formed within valve body 90.
  • rod-end supply valve 30 may include a two-position spring biased valve element 208' supported within bore 210 formed within valve body 90.
  • Head-end and rod-end valve elements 200' and 208' may be solenoid actuated and configured to move between a first position at which fluid is passed to a respective chamber 50, 52 and a second position at which fluid is blocked from flowing to a respective chamber 50, 52.
  • a blocking portion 201', 209' of the flow passing valve may block fluid flow within one of pressure balancing passageways 66, 68.
  • blocking portion 201', 209' of the flow blocking valve may allow fluid flow within one of pressure balancing passageways 66, 68.
  • blocking portion 201' of head-end supply valve element 200' blocks fluid flow in pressure balancing passageway 66.
  • blocking portion 209' of head-end supply valve element 208' blocks fluid flow in pressure balancing passageway 68.
  • the disclosed hydraulic system may be applicable to any work machine that includes a fluid actuator where balancing of pressures and/or flows of fluid supplied to the actuator is desired.
  • the disclosed hydraulic system may provide high response pressure regulation that protects the components of the hydraulic system and provides consistent actuator performance in a low cost simple configuration.
  • Hydraulic cylinder 16 may be movable by fluid pressure in response to an operator input. Fluid may be pressurized by source 24 and directed to valve body 90 via port 102. The pressurized fluid may be further directed from port 102 to head-end and rod-end supply valves 26 and 30.
  • one of head-end and rod-end supply valves 26 and 30 may move to the open position to direct the pressurized fluid to the appropriate one of first and second chambers 50, 52.
  • one of head-end and rod-end drain valves 28, 32 may move to the open position to direct fluid from the appropriate one of the first and second chambers 50, 52 to tank 34 via port 100 to create a pressure differential across piston 54 that causes piston assembly 48 to move.
  • head-end supply valve 26 may move to the open position to direct pressurized fluid from source 24 to first chamber 50.
  • rod-end drain valve 32 may move to the open position to allow fluid from second chamber 52 to drain to tank 34. If a retraction of hydraulic cylinder 16 is requested, rod-end supply valve 30 may move to the open position to direct pressurized fluid from source 24 to second chamber 52. Substantially simultaneous to the directing of pressurized fluid to second chamber 52, head-end drain valve 28 may move to the open position to allow fluid from first chamber 50 to drain to tank 34.
  • Proportional pressure compensating valve 36 may account for these affects by proportionally moving the valve element of proportional pressure compensating valve 36 between the flow passing and flow blocking positions in response to fluid pressures within hydraulic system 22 to provide a substantially constant predetermined pressure drop across all supply valves of hydraulic system 22.
  • shuttle valve 74 may be biased by the higher pressure toward the flow passing valve, thereby communicating the lower pressure from the flow passing valve and one of the fluid passageways 66, 68 to proportional pressure compensating valve 36 via passageway 82. This lower pressure communicated to proportional compensating valve 36 may then act together with the force of the proportional pressure compensating valve spring against the pressure from fluid passageway 78.
  • proportional pressure compensating valve 36 may then either move the valve element of proportional pressure compensating valve 36 toward the flow blocking or flow passing positions. As the pressure from source 24 drops, proportional pressure compensating valve 36 may move toward the flow passing position and thereby maintain the pressure within upstream common fluid passageway 60. Similarly, as the pressure from source 24 increases, proportional pressure compensating valve 36 may move toward the flow blocking position to thereby maintain the pressure within upstream common fluid passageway 60. In this manner, proportional pressure compensating valve 36 may regulate the fluid pressure within hydraulic system 22.
  • Proportional pressure compensating valve 36 may also be configured to reduce pressure and/or flow fluctuations within hydraulic system 22 caused by the occurrence of regeneration processes within hydraulic system 22.
  • Proportional pressure compensating valve 36 may accommodate this supply of high pressure fluid by moving the valve element of proportional pressure compensating valve 36 toward the flow blocking position. In this manner, proportional pressure compensating valve 36 may provide substantially constant pressure even during regeneration processes.
  • hydraulic system 22' The operation of hydraulic system 22' is similar to that of hydraulic system 22 with the following difference.
  • pressure within downstream common signal fluid passageway 62 on the flow passing valve side of shuttle valve 74 may be lower than the pressure of the fluid within the downstream common signal fluid passageway 62 on the flow blocking side of shuttle valve 74.
  • shuttle valve 74 may be biased by the higher pressure toward the flow passing valve, thereby communicating only the lower pressure from the flow passing valve to proportional pressure compensating valve 36 as fluid flow within one of fluid passageways 66,68 may be blocked.
  • valve element 200' may block fluid flow within fluid passageway 66.
  • Shuttle valve 74 may be biased by higher pressure toward head-end supply valve 26 thereby communicating low pressure from head-end supply valve 26 to fluid passageway 82. Because valve element 200' may block fluid flow in pressure balancing fluid passageway 66, shuttle valve 74 may only communicate low pressure from head-end supply valve 26 to proportional pressure compensating valve 36 thereby reducing the fluid flow of low pressure communicated shuttle valve 74.
  • Various components may be included in valve body 90.
  • valve body 90 may provide a compact hydraulic valve unit and may realize reductions in space and/or material potentially reducing material and manufacturing costs. Valve body may further improve reliability by reducing the number of hydraulic line junctions thus potentially reducing leaks and/or chances of failure and improving signal strength and/or response timing.
  • proportional pressure compensating valve 36 Because of proportional pressure compensating valve 36 is hydro- mechanically actuated, pressure fluctuations may be quickly accommodated before they can significantly influence motion of hydraulic cylinder 16 or life of components. In particular, the response time of proportional pressure compensating valve 36 may be about 200 hz or higher, which is much greater than typical solenoid actuated valves that respond at about 5-15 hz. In addition, because proportional pressure compensating valve 36 may be hydro-mechanically actuated rather than electronically controlled, the cost may be minimized.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

Système hydraulique (22) ayant une source (24) de fluide pressurisé, un actionneur de fluide (16) avec une première chambre (50) et une seconde chambre (52), et un corps (90). Le corps a une première vanne (26) configurée pour faire communiquer sélectivement de manière fluide la source avec la première chambre et une seconde vanne (30) configurée pour faire communiquer sélectivement de manière fluide la source avec la seconde chambre. Le corps a également une vanne de compensation de pression proportionnelle (36) pour commander une pression d'un fluide guidé entre la source et les première et seconde chambres et une voie de passage d'alimentation (61) disposée entre la source et les première et seconde vannes en parallèle et la vanne de compensation de pression proportionnelle est disposée dans la voie de passage d'alimentation.
PCT/US2006/015360 2005-04-29 2006-04-25 Systeme hydraulique ayant un compensateur de pression WO2006118841A1 (fr)

Priority Applications (3)

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JP2008508974A JP5297187B2 (ja) 2005-04-29 2006-04-25 圧力補償装置を有する油圧システム
CN2006800146149A CN101166904B (zh) 2005-04-29 2006-04-25 具有压力补偿器的液压系统
DE112006001100.6T DE112006001100B4 (de) 2005-04-29 2006-04-25 Hydrauliksystem mit Druckkompensator

Applications Claiming Priority (2)

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US11/117,385 2005-04-29
US11/117,385 US7204185B2 (en) 2005-04-29 2005-04-29 Hydraulic system having a pressure compensator

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WO2006118841A1 true WO2006118841A1 (fr) 2006-11-09

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WO (1) WO2006118841A1 (fr)

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DE112006001100T5 (de) 2008-03-13
CN101166904B (zh) 2011-05-11
JP2008539383A (ja) 2008-11-13
US20060243128A1 (en) 2006-11-02
CN101166904A (zh) 2008-04-23
DE112006001100B4 (de) 2016-06-09
US7204185B2 (en) 2007-04-17
JP5297187B2 (ja) 2013-09-25

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